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Mesonychia ("middle claws") is an extinct taxon of small- to large-sized carnivorous ungulates related to artiodactyls. Mesonychians first appeared in the early Paleocene , went into a sharp decline at the end of the Eocene , and died out entirely when the last genus, Mongolestes , became extinct in the early Oligocene .
The skull of Mesonyx (left), compared with skulls of a wolf, bear, and Andrewsarchus Mesonyx species have been estimated as 1.25-1.5m (4.5–5 ft.) long in life, not including the tail. Weight estimates vary, from 20 to 55 kg (about 45-120 lbs).
Mesonychidae (meaning "middle claws") is an extinct family of small to large-sized omnivorous-carnivorous mammals.They were endemic to North America and Eurasia during the Early Paleocene to the Early Oligocene, and were the earliest group of large carnivorous mammals in Asia.
Holotype skull cast of A. mongoliensis as seen from below. Andrewsarchus was initially regarded as a mesonychid, [1] and Paratriisodon as an arctocyonid. [13] In 1995, the former became the sole member of its own subfamily, Andrewsarchinae, within Mesonychia. [16]
Harpagolestes was a large animal, with a skull length of a half a meter in some species. [3] Fossil specimens have been recovered in the United States, Canada, Mongolia, China, and controversially North Korea. [1] Harpagolestes exhibits strong, curved
A 13,600-year-old mastodon skull was uncovered in an Iowa creek, state officials announced this week. Iowa's Office of the State Archaeologist said in a social media post that archaeologists found ...
Triisodon is the type genus of the family Triisodontidae, one of the three families within Mesonychia (the other two being Mesonychidae and Hapalodectidae). Other North American triisodontid genera, including Goniacodon , Eoconodon , and Stelocyon , have been referred to Triisodon . [ 4 ]
Skull. Morphologists long thought that Sinonyx was the direct ancestor of Cetacea (whales and dolphins), but the discovery of well-preserved hind limbs of archaic cetaceans as well as more recent DNA phylogenetic analyses [3] [4] [5] now indicates that cetaceans are more closely related to hippopotamids and other artiodactyls than they are to mesonychids, and this result is consistent with ...